![]() Slaves only respond to queries from the master. The slave/server responds either by supplying data or taking an action. In Modbus systems, a master or client initiates queries to a slave or server (the measurement device). ![]() ![]() How to read data from Modbus devices over serial (RS232, RS422, RS485) and network (TCP/IP) lines, using the Windmill COMIML software as an example. This page remains to help our existing customers. The Windmill software is now only available with our hardware. Sorry we no longer sell software to log data from Modbus devices. ![]() Data Acquisition » Serial Communications » Connecting Modbus Devices Reading ASCII and RTU Modbus Devices via RS232, RS422, RS485 or TCP/IP
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